Micrometer caliper



July 17, 1923.

, L. O. BEARD MICRQMETER CALIPER File; Sept. 6. 1922 Patented in, 17, 1923.

UNITED STATES LAWRENCE 0. BEARD, F LA NCASTEB, PENNSYLVANIA.

' urcnonnrnn. CALIBER.

Application filed September 6, 1922. Serial No. 526,515.

f To all whom it may concern: Be it known that LAWRENCE O. BEARD, a" citizen of the United States of America, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, has ineters,

vented certain new and useful Improvements in. Micrometer Calipers, of which the following is a specification.

My invention relates to micrometer-cali- 1 pers,'and has for its primary, object to provide a simply constructed and conveniently manipulated instrument for measuring the -inside dimensions of internal combustion engine cylinders and the like.

Another object of my invention is to provide an alining device adapted for use with the ordinary type ofmicrometer ga e.

Other and further objects and ad antages of my invention will be in part described and in part obvious as this specification is proceeded with. v In the accompanying drawings forming part of this specification Figure 1 is a plan view of my invention inserted in the cylinder of an internal combustion engine showing the position of the parts when adjusted to take the measurement of the cylinder.

Figure 2 is a similar view showing the late. adjusted to facilitate removal of the invention from the cylinder. Fi ure 3 is a perspective view of a modified orm of plate 12.

Referring more particularly to the draw: ings 5., denotes a icaliper of ordinary construction comprising an internally threaded female member or sleeve 6, in which is threadedly mounted the male member or spindle 7 said members being provided'with d the usual graduationsB and 9, respectively.

A set screw 10, is provided, for locking the members 6 and 7 together when the desired measurement has been effected.

In making inside measurements of round holes or bores, such as-the. diameter of an internal combustion engine, it is essential that means be provided for quickly centering the micrometer. This is accomplished by slidably mounting the female member or sleeve 6, in a tubular guide member 11, carried by the plate 12, a slot 13, being formed in the guide member for the-reception ofthe shank of the set screw 10. The ends of the plate 12 are bent outwardly to provide 3 flanges or legs220, these flanges or legs being.

parallel and ofexactly the same length. A. split ring 14, prevents the, micrometer from becoming detached from the plate 12, when in use. I

When used for measuring inside diamfor instance the diameter of an internal combustion engine cylinder 15, the user inserts the tool in thecylinder 15 as illustrated in Figure 2 and after pressing the plate 12, into Figure 1 position by forcing the parallel edges-of feet 20 of the plate 12 against the cylinder wall, then proceeds to unscrew the spindle until the end of the latter and the opposite end of the sleeve 6, engage opposite walls of the cylinder, which position is also shown in Figure 1. The set screw 10, is ,then screwed up, and the plate is moved inwardly on the sleeve 6, to Figure 2 position to permit of the micrometer being tilted to facilitateremoval thereof for readin purposes.

In igure 3, I have illustrated a modified form of late 12 .wherein the flanges or legs 20'. are eliminated, it of course being understood that the side and end edges of the plate will be parallel.

The plat 12, and tubular guide member 11, carried thereby are preferably sold with and form a part of the micrometer, but may be sold as a separate article of manufacture 85 for use with micrometers already in use.

Having thus described my invention, what I claim as my invention is: j

1. A micrometer-cali er comprising a plate having parallel si e ortions, a tubular guide member on said p ate, a sleeve slidably mounted in said guide member and extending through said plate, and .a measuring spindle threaded in'said sleevewhereby relative rotation between the spindle and the sleeve will adjust the spindle longitudi- .nally of the sleeve, said sleeve and said spindle having thereon.

2. 'A- micrometer-caliper comprising a plate having parallel edges, a" tubular guide member on said plate, a sleeve slidably mounted in said guide member and extending through said plate, a measuring spindle threaded in said sleeve whereby relative 1105 rotation between the spindle and the sleeve will adjust the spindle longitudinally of the sleeve, a set screw for locking said sleeve to 7 said spindle, said guide member being slotted for cooperating 'graduations the reception of the shank of said i screw, and said sleeve and said spindle havthe sleeve will adjust the spindle longitudi- '10 ing cooperating graduations thereon. nally of the sleeve, said sleeve and spindle micrometer-caliper comprising 9. having cooperating graduations thereon. plate having parallel edges, said plate hav- In testimony whereof I aflix my signa- 5 11115 a guide opening therein, a sleeve slidture in presence of two witnesses.

a mounted in said guide opening and ex- LAWRENCE, O. BEARD. tendin through said plate, and a measur- Witnesses:

in? spindle threaded in said sleeve whereby Gno. Ross ESHLEMAN, re etive rotation between the spindle and L. Lmvne. 

